Here is a design for a full-featured motor shield that will be able
to power many simple to medium-complexity projects.L293D is a monolithic integrated, high voltage, high current,
4-channel driver.Basically this means using this chip you can use DC motors and
power supplies of up to 36 Volts, thats some pretty big motors and
the chip can supply a maximum current of 600mA per channel, the
L293D chip is also what’s known as a type of H-Bridge.The H-Bridge is typically an electrical circuit that enables a
voltage to be applied across a load in either direction to an
output, e.g. motor.2 connections for 5V 'hobby' servos connected to the Arduino's
high-resolution dedicated timer - no jitter!4 H-Bridges: L293D chipset provides 0.6A per bridge (1.2A peak)
with thermal shutdown protection, internal kickback protection
diodes. Can run motors on 4.5VDC to 25VDC.Up to 4 bi-directional DC motors with individual 8-bit speed
selection (so, about 0.5% resolution).Up to 2 stepper motors (unipolar or bipolar) with single coil,
double coil or interleaved stepping.Pull down resistors keep motors disabled during power-up.Big terminal block connectors to easily hook up wires (18-26AWG)
and powerArduino reset button brought up top.2-pin terminal block and jumper to connect external power, for
separate logic/motor supplies.

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